CREATE UNIQUE Match meets Create The CREATE UNIQUE clause is a mix of MATCH and CREATE — it will match what it can, and create what is missing. Reference: CREATE UNIQUE manual page Related: :help MATCH :help CREATE :help MERGE :help Cypher MATCH (us:Country) WHERE us.name = 'United States' CREATE UNIQUE (us)-[:STATE]->(ca {name:'California'}) RETURN ca Finds the country named "United States". If found, will then create a new state named California, but only if it doesn't already exist.
